Method and apparatus for detecting presence of objects
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United States of America Patent
Stats
-
Aug 15, 1989
Grant Date -
N/A
app pub date -
May 29, 1987
filing date -
May 30, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for capacitively detecting the presence of a tape cassette within a vending machine or the like. The testing system within the machine employs an ac source connected to a source electrode and a detector connected to a detector electrode. A coded pattern is provided along the side wall of the cassette with a pair of series connected electrodes arranged to oppose the electrodes of the testing system. When aligned, the capacitances formed between the testing system electrode and the coded pattern complete an electrical circuit from the source to the detector through the cassette. The completing of the circuit indicator the presence of the cassette.
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